Best Steam Includes Source SDK Games

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Name Release Date Current Players All-Time Peak Rating
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 50 940 100 056 95.06
Garry's Mod Garry's Mod 29 Nov, 2006 28 345 73 863 96.10
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 24 270 162 399 96.78
Half-Life 2 Half-Life 2 16 Nov, 2004 2 373 64 085 96.46
Black Mesa Black Mesa 6 Mar, 2020 1 451 7 158 93.89
Portal Portal 10 Oct, 2007 675 20 672 97.20
No More Room in Hell No More Room in Hell 31 Oct, 2013 509 10 922 88.54
Left 4 Dead Left 4 Dead 17 Nov, 2008 497 30 616 94.66
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 331 7 507 89.63
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 206 2 702 88.39
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 204 9 335 92.73
Entropy : Zero 2 Entropy : Zero 2 20 Aug, 2022 126 3 751
Synergy Synergy 3 Oct, 2008 102 2 940 88.30
Astro Colony Astro Colony 7 Nov, 2022 89 2 751 79.07
Fistful of Frags Fistful of Frags 9 May, 2014 81 3 537 89.61
Menace from the Deep Menace from the Deep 2024 62 1 653 81.15
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 55 1 271 70.39
Pirates, Vikings, and Knights II Pirates, Vikings, and Knights II 12 Feb, 2010 54 878 84.99
Selaco Selaco 30 May, 2024 53 1 528 88.56
Treason Treason 31 Jan, 2023 51 226
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